A wire of length L, area of cross section A is hanging
from a fixed support. The length of the wire
changes to ``L_1``
when mass M is suspended from its
free end. The expression for Young’s modulus is :
(1)
``\frac{MgL_1}{AL}``
(2)
``\frac{Mg(L_1 - L)}{AL}``
(3)
``\frac{MgL}{AL_1}``
(4)
``\frac{MgL}{A(L_1 - L)}``